Materials Literature
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We report the results of a comprehensive x-ray-scattering study of multilayer ethylene physisorbed on graphite. At temperatures well below the triple point of bulk ethylene (103.8 K), adsorption only occurs up to a finite number of layers; any further addition of material results in the nucleation of bulk crystallites…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric relaxations and molecular motions in homopolymers and copolymers of vinylidene fluoride and trifluoroethyleneT. Furukawa, M. Ohuchi, A. Chiba, and M. DateCite this: Macromolecules 1984, 17, 7, 1384–1390Publication Date (Print):July 1, 1984Publication History Publi…
A 7Be transport test was performed in the Beryllium-7 Experimental Lithium Loop with hot leg at 270°C and cold leg at 230°C. The “cold leg” test stringer was in a rising temperature region at 250°C. A total of 108 test coupons were included in the material compatibility and deposition test programs, containing AISI Ty…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and mechanism of oxidation of methyl ethyl ketone and cyclohexanone by potassium bis(tellurato)cuprate(III)Ganesh Prasad Panigrahi and A. C. PathyCite this: Inorg. Chem. 1984, 23, 14, 2133–2138Publication Date (Print):July 1, 1984Publication History Published online…
The general theory developed by the authors for the light propagation in cholesteric liquid crystals has been applied to the analysis of the high resolution reflectance spectra measured in a monodomain sample, in various optical conditions and in a wide wavelength range by Takezoe et al. The dispersion relation for th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal degradation of sodium dodecyl sulfateJohn M. Patterson, Zbigniew Kortylewicz, and Walter T. Smith Jr.Cite this: J. Agric. Food Chem. 1984, 32, 4, 782–784Publication Date (Print):July 1, 1984Publication History Published online1 May 2002Published inissue 1 July 1984ht…
Abstract The crystal structure of a new synthetic compound with the composition of TlInSiS4 has been determined. The crystal is orthorhombic, and the space group is Pbnm with Z=8. The cell dimensions are a=11.74(1), b=17.038(7), and c=7.285(3) Å. The structure was solved by the Patterson method and refined to a final…
Abstract Two‐layer films were produced by using the blown‐film coextrusion apparatus constructed in our laboratory. For this study, we have produced films of the following combinations: (1) LDPE/CXA 3095; (2) LDPE/Plexar 3; (3) LDPE/EMA; (4) nylon 6/LDPE; (5) nylon 6/CXA 3095; (6) nylon 6/Plexar 3; (7) nylon 6/EMA. Te…
Semiconductor valence-band edges are computed on absolute energy scales determined by Herman-Skillman and Hartree–Fock neutral atom ionization energies, respectively. These calculations use Harrison’s (1977) elementary theory of heterojunctions. Differences are compared with experimental heterojunction band discontinu…
Unidirectionally crystallized CaO‐P 2 O 5 glass‐ceramics were produced by reheating glass rods between 450° and 580°C (glass transition temperature ∼500°C) under a temperature gradient of 30°C/cm. These glass‐ceramics exhibit high bending strength (∼650MN/m 2 ) and toughness. Sample preparation is described and compar…
The collapse of a low density cloud of bubbles is studied using matched asymptotic expansions. Equations describing the motion and deformation of an individual bubble accounting for its interaction with the other bubbles in the cloud are derived. Numerical results for the case of a symmetrical cloud configuration show…
Performances and energy consumption of pilot-scale spiral wound and hollow fiber modules were compared. The feed was cottage cheese whey acidified to pH 3 and prefiltered. Exponential flux decay behavior was typical for both units. Flux was affected by pressure in the first 60 min of operation; for the spiral wound un…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparative photophysics of platinum(II) and platinum(IV) porphyrinsDongho Kim, Dewey Holten, Martin Gouterman, and Johann W. BuchlerCite this: J. Am. Chem. Soc. 1984, 106, 14, 4015–4017Publication Date (Print):July 1, 1984Publication History Published online1 May 2002Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT1,4-Diaminoalkanes from pyrroles. A new synthetic approach to substituted putrescinesDaniel O. Alonso Garrido, Graciela Buldain, and Benjamin FrydmanCite this: J. Org. Chem. 1984, 49, 14, 2619–2622Publication Date (Print):July 1, 1984Publication History Published online1 May…
Abstract The title compound with an ordered monoclinic (pseudotetragonal) perovskite structure has been prepared. The lattice constants are a=5.5239(5), b=5.5253(4), c=7.8936(6) Å, β=90.16(1)°, and Z=2. The superstructure was found to be due to a layer-like ordering of Na+ and La3+ ions along alternate c-planes as wel…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotocatalytic oxygen isotopic exchange between oxygen molecule and the lattice oxygen of titanium dioxide prepared from titanium hydroxideShinri Sato, Toru Kadowaki, and Keiiti YamagutiCite this: J. Phys. Chem. 1984, 88, 14, 2930–2931Publication Date (Print):July 1, 1984Pub…
Abstract Sodium metatungstate, Na 6 [H 2 W 12 O 40 ] is presented as a new medium for density‐gradient centrifugation. This electrolyte may be used in aqueous, aqueous sodium chloride, or in methanol solutions. The sedimentation behaviour of sodium metatungstate in binary (Na 6 [H 2 W 12 O 40 ]/H 2 O) and in ternary (…
We have quantitatively observed for the first reported time nanosecond-laser-induced optical wave mixing and ultrasonic wave generation in nematic liquid-crystal films. The effect may prove useful for microsecond wave-front conjugation with a moderate-power laser or gigahertz acousto-optic switching.
The problem of bubble-bubble interaction is studied experimentally. The motions of multiple gas bubbles attached to a solid wall by a shock wave are observed by using a high speed camera, and the induced impulsive pressures are measured. On the basis of these results, the effects of number and configuration of gas bub…
The dihydrate of ammonia has been isolated for the first time. Its x-ray powder diffraction pattern can be indexed on a cubic unit cell a=7.118 Å with a 95% confidence limit of 0.015 Å at ∼105 K, and Z=4. The number of diffraction lines, neglect of the hydrogen atoms, and the assumption that the atoms are on sites of…